body {
    background: url("../img/bjt.jpg") no-repeat;
}

div {
    width: 400px;
    height: 300px;
    margin: 100px auto;
    text-align: center;
    background-color: rgba(204, 204, 204, 0.719);
    border-radius: 6px;
    padding-top: 20px;
}

div h1 {
    font-size: 26px;
    margin: 10px;
}

div input {
    font-size: 14px;
    width: 200px;
    height: 30px;
    margin-top: 20px;
}

div button {
    border: 1px solid #ccc;
    border-radius: 6px;
    margin: 30px;
    width: 70px;
    height: 30px;
}